This document provides an overview of OData, including: - OData is a standard API for accessing data in a RESTful manner that allows for querying and interoperability. - OData addresses limitations of REST by standardizing resource naming, paging support, querying, and status codes. - The document demonstrates OData resource identification, operations, representations, query parameters, and tools/libraries, concluding with a link to a GitHub demo.

1. Md. Kamrul Hasan
Sr. Software Engineer & Instructor
https://bd.linkedin.com/in/kamrul-hasan-29361224
OData Fundamental

2. Agenda
 What is OData?
 Why OData?
 OData Resource identification.
 OData Resource operation.
 OData Resource representation.
 OData Query Option Parameters.
 Tools & Libraries
 Demo

3.  A standard API for Data Access
 Best way to REST.
 Queryable and interoperable RESTful APIs.
 OASIS-approved industry standard.
 Uniform way to describe both data and the
data model.
What is OData?

4. Why OData why not RESTful Services.
 REST is an architectural style, but it is
not a standard.
 It leaves few design decisions open to
us.
 How should we name our resources?
 How should we support paging?
 What about data shaping or querying data?
 Which status code should be returned?
 Well this is where OData comes into the
picture.

5. OData Resource Identification.
http://services.odata.org/v4/OData/OData.svc/Products/$count
service root URI resource
path
query
options
(optional)
Entity-set /Products
SingleEntry /Products(1)
MemberAccess /Products(1)/Price
LinkTraversal /Categories(2)/Products
URI Format:
JSON:
http://services.odata.org/v4/OData/OData.svc/Products?$format=json
Atom:

6. OData Resource operation.
 GET
 POST
 PUT
 PATCH
 DELETE

7. OData Resource representation.
 OData uses different formats for
representing data and the data model.
 Data: JSON, Atom(xml)
http://services.odata.org/v4/OData/OData.svc/Products
 Data Model: CSDL (Common Schema
Definition Language)
http://services.odata.org/v4/OData/OData.svc/$metadata

8. OData Query Option Parameters.
All Product
http://services.odata.org/v4/OData/OData.svc/Products
Product By Key
http://services.odata.org/v4/OData/OData.svc/Products(1)
More Filter
..OData.svc/Products?$orderby=Rating
..OData.svc/Products?$top=5
..OData.svc/Products/?$filter=Price lt 100
..OData.svc/Categories(1)/Products(1)/Supplier/Address/City

9. Tools & Libraries
 RESTier provides facilities to bootstrap an OData service
like what WCF Data Services (which is sunset) does.
 XOData is a generic OData API/Service visualizer and
explorer.

10. Demo
https://github.com/EhanAreesha/ODataFundamental
Thanks
11/14/2016